linux-kernel - Qustion on function try_module

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Message-ID: <4cc25cb20801112152q324c94aegb71a357d47ba3590@mail.gmail.com>
Date:	Sat, 12 Jan 2008 13:52:20 +0800
From:	rmingming <mingming.nk@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Qustion on function try_module_get()

Hi,
 I have a problem about the try_module_get function, I don't know if someone
removed the module just AFTER line 372 and BEFORE line 373, then
what happens? Because in this situation, the variable "module" will be
incorrect, and module_is_live function will lead to unpredicatable behaviour.

368 static inline int try_module_get(struct module *module)
369 {
370         int ret = 1;
371
372         if (module) {
373                 unsigned int cpu = get_cpu();
374                 if (likely(module_is_live(module)))
375                         local_inc(&module->ref[cpu].count);
376                 else
377                         ret = 0;
378                 put_cpu();
379         }
380         return ret;
381 }

Best wishes to all,

rmingming
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